#include <iostream>
#include <math.h>
#include <vector>
#include <string>
#include <algorithm>
#include <queue>
#include <stack>
#include <map>
#include <cstring>
#include <iomanip>
#include <set>
#include <bitset>
#include <unordered_map>
using namespace std;
using ll = long long;
using pii = pair<int,int>;
using piii = tuple<int,int,int>;
#define f first
#define s second
#define endl '\n'
#define all(x) begin(x),end(x)
int main(){
int n;cin >> n;
int d;cin >> d;
vector<piii> vc;
vector<int> checking;
for(int i{};i < n;i++){
int a,b,c;cin >> a >> b >> c;
vc.emplace_back(a,b,c);
checking.emplace_back(c);
}
vc.emplace_back(d,0,0);
sort(all(vc));
sort(all(checking));
checking.erase(unique(all(checking)),checking.end());
int ans = d;
int si = checking.size();
for(int i{};i < si;i++){
int F = checking[i];
int cur = 0;
int val = 0;
int last = 0;
for(auto [a,b,c]:vc){
cur -= a-last;
val = max(val,-cur);
if(c >= F) cur += b;
last = a;
}
if(val <= F){
ans = min(ans,val);
}
//cout << F << " " << val << endl;
}
cout << ans;
}
